1211100101 has 2 divisors, whose sum is σ = 1211100102. Its totient is φ = 1211100100.

The previous prime is 1211100083. The next prime is 1211100113. The reversal of 1211100101 is 1010011121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 730350625 + 480749476 = 27025^2 + 21926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211100101 - 2¹⁴ = 1211083717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211100131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605550050 + 605550051.

It is an arithmetic number, because the mean of its divisors is an integer number (605550051).

Almost surely, 2^1211100101 is an apocalyptic number.

It is an amenable number.

1211100101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211100101 is an equidigital number, since it uses as much as digits as its factorization.

1211100101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2, while the sum is 8.

The square root of 1211100101 is about 34800.8635094016. The cubic root of 1211100101 is about 1065.9250783643.

Adding to 1211100101 its reverse (1010011121), we get a palindrome (2221111222).

The spelling of 1211100101 in words is "one billion, two hundred eleven million, one hundred thousand, one hundred one".